Influence of infection on milk production and quality of Holstein dairy cows.

We wished to determine if infection can negatively impact milk quality and production in Holstein dairy cows. For this Research Communication, milk samples (271) from Holstein cows from 3 herds were screened for by real-time PCR. Positive ( = 21) and negative animals ( = 21) were matched by herd, age, lactations and days in milk (DIM).

Effects of 3 Different Commercial Vaccines Formulations against BVDV and BHV-1 on the Inflammatory Response of Holstein Heifers.

After vaccination, vaccine components must activate the immune response, but the ideal vaccine should not result in undesirable effects in cattle. The aim of this study was to evaluate the inflammatory and humoral responses and adverse reactions induced by three adjuvanted commercial vaccines against bovine viral diarrhea virus (BVDV) and bovine herpesvirus 1 (BHV-1). Holstein heifers ( = 35) were divided into four groups by adjuvant compounds: Vaccine A (Alum; =9), Vaccine B (Oil-in-water; =10), Vaccine C (Amphigen/Quil A cholesterol and dimethyl-dioctadecyl ammonium (DDA) bromide (QAD; =10), and Control (=6).